Whether your closet looks like a Patagonia outlet store or you view hiking as a prelude to a coma-inducing brunch, Boulder's Flatirons should satisfy your hiking needs. The rocky Boulder foothills are easily accessible from busy Chautauqua Park, and a variety of trails offer challenges for experts and beginners alike, but each features access to the same winding terrain and sweeping vistas of Boulder. One of our favorites? The 3.5-mile Royal Arch trail, a moderately strenuous but totally doable climb that peaks at an impressive rock arch, from which you can see practically to Kansas. No matter which trail you choose, though, the area's opening salvo alone — a slow, steep climb out of the open park and into the denser hiking areas — will burn enough calories to make it through that brunch guilt-free.